Just got the software. Looks exactly like what I need.
I have an issue where my mp3 player only recognizes album art with the filename of cover.jpg. This is an issue for me as most of the cover art I have is folder.jpg (my cover art downloader automatically saves using this filename and this cannot be altered).
I am trying to rename all folder.jpg files to cover.jpg, including in all subdirectories of the main directory.
Please see the attached image, and tell me what I am doing wrong. I cannot figure out how to initiate the renaming process.